[20170504]Linux TCP keepalive timers.txt

--//上午仔細看一些文檔,發現實際上netstat命令就有輸出,參數--timer或者-o參數.

# netstat -otun

Active Internet connections (w/o servers)

Proto Recv-Q Send-Q Local Address?????????????? Foreign Address???????????? State?????? Timer

tcp??????? 0????? 0 192.168.100.78:60479??????? 192.168.100.78:1521???????? ESTABLISHED off (0.00/0/0)

tcp??????? 0??? 224 192.168.100.78:22?????????? 192.168.101.6:50855???????? ESTABLISHED on (0.38/0/0)

tcp??????? 0????? 0 192.168.100.78:1521???????? 192.168.100.78:60479??????? ESTABLISHED keepalive (5864.73/0/0)

tcp??????? 0????? 0 192.168.100.78:22?????????? 192.168.101.6:50817???????? ESTABLISHED keepalive (115.84/0/0)

The interpretation of field is, first field = timer countdown value, second field = no. of retransmissions, third field

= number of keepalive probes sent.

--//參數1記數到0發出請求檢查網絡.

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